diff --git a/src/commonMain/kotlin/com/insanusmokrassar/krontab/Executes.kt b/src/commonMain/kotlin/com/insanusmokrassar/krontab/Executes.kt
index e0934d2..6c2fe51 100644
--- a/src/commonMain/kotlin/com/insanusmokrassar/krontab/Executes.kt
+++ b/src/commonMain/kotlin/com/insanusmokrassar/krontab/Executes.kt
@@ -1,25 +1,32 @@
 package com.insanusmokrassar.krontab
 
-suspend inline fun CronDateTimeScheduler.executeInfinity(noinline block: suspend () -> Unit) = doInLoop {
+import com.soywiz.klock.DateTime
+import kotlinx.coroutines.delay
+
+suspend inline fun KronScheduler.doWhile(noinline block: suspend () -> Boolean) {
+    do {
+        delay(next().unixMillisLong - DateTime.now().unixMillisLong)
+    } while (block())
+}
+suspend inline fun doWhile(
+    scheduleConfig: String,
+    noinline block: suspend () -> Boolean
+) = createSimpleScheduler(scheduleConfig).doWhile(block)
+
+suspend inline fun KronScheduler.doInfinity(noinline block: suspend () -> Unit) = doWhile {
     block()
     true
 }
-suspend inline fun executeInfinity(
+suspend inline fun doInfinity(
     scheduleConfig: String,
     noinline block: suspend () -> Unit
-) = createCronDateTimeScheduler(scheduleConfig).executeInfinity(block)
+) = createSimpleScheduler(scheduleConfig).doInfinity(block)
 
-suspend inline fun CronDateTimeScheduler.executeWhile(noinline block: suspend () -> Boolean) = doInLoop(block)
-suspend inline fun executeWhile(
-    scheduleConfig: String,
-    noinline block: suspend () -> Boolean
-) = createCronDateTimeScheduler(scheduleConfig).executeWhile(block)
-
-suspend inline fun CronDateTimeScheduler.executeOnce(noinline block: suspend () -> Unit) = doInLoop {
+suspend inline fun KronScheduler.doOnce(noinline block: suspend () -> Unit) = doWhile {
     block()
     false
 }
-suspend inline fun executeOnce(
+suspend inline fun doOnce(
     scheduleConfig: String,
     noinline block: suspend () -> Unit
-) = createCronDateTimeScheduler(scheduleConfig).executeOnce(block)
+) = createSimpleScheduler(scheduleConfig).doOnce(block)
diff --git a/src/commonMain/kotlin/com/insanusmokrassar/krontab/KronScheduler.kt b/src/commonMain/kotlin/com/insanusmokrassar/krontab/KronScheduler.kt
new file mode 100644
index 0000000..b4ea91f
--- /dev/null
+++ b/src/commonMain/kotlin/com/insanusmokrassar/krontab/KronScheduler.kt
@@ -0,0 +1,7 @@
+package com.insanusmokrassar.krontab
+
+import com.soywiz.klock.DateTime
+
+interface KronScheduler {
+    suspend fun next(relatively: DateTime = DateTime.now()): DateTime
+}
diff --git a/src/commonMain/kotlin/com/insanusmokrassar/krontab/SchedulerShortcuts.kt b/src/commonMain/kotlin/com/insanusmokrassar/krontab/SchedulerShortcuts.kt
index 92871eb..5688e24 100644
--- a/src/commonMain/kotlin/com/insanusmokrassar/krontab/SchedulerShortcuts.kt
+++ b/src/commonMain/kotlin/com/insanusmokrassar/krontab/SchedulerShortcuts.kt
@@ -6,24 +6,24 @@ import com.insanusmokrassar.krontab.internal.CronDateTime
 internal val anyCronDateTime by lazy {
     CronDateTime()
 }
-val AnyTimeScheduler by lazy {
+val AnyTimeScheduler: KronScheduler by lazy {
     CronDateTimeScheduler(listOf(anyCronDateTime))
 }
-val EverySecondScheduler
+val EverySecondScheduler: KronScheduler
     get() = AnyTimeScheduler
 
-val EveryMinuteScheduler by lazy {
+val EveryMinuteScheduler: KronScheduler by lazy {
     buildSchedule { minutes { 0 every 1 } }
 }
 
-val EveryHourScheduler by lazy {
+val EveryHourScheduler: KronScheduler by lazy {
     buildSchedule { hours { 0 every 1 } }
 }
 
-val EveryDayOfMonthScheduler by lazy {
+val EveryDayOfMonthScheduler: KronScheduler by lazy {
     buildSchedule { dayOfMonth { 0 every 1 } }
 }
 
-val EveryMonthScheduler by lazy {
+val EveryMonthScheduler: KronScheduler by lazy {
     buildSchedule { months { 0 every 1 } }
 }
\ No newline at end of file
diff --git a/src/commonMain/kotlin/com/insanusmokrassar/krontab/CronDateTimeScheduler.kt b/src/commonMain/kotlin/com/insanusmokrassar/krontab/StringParser.kt
similarity index 50%
rename from src/commonMain/kotlin/com/insanusmokrassar/krontab/CronDateTimeScheduler.kt
rename to src/commonMain/kotlin/com/insanusmokrassar/krontab/StringParser.kt
index ad2cc95..1e9063f 100644
--- a/src/commonMain/kotlin/com/insanusmokrassar/krontab/CronDateTimeScheduler.kt
+++ b/src/commonMain/kotlin/com/insanusmokrassar/krontab/StringParser.kt
@@ -1,25 +1,39 @@
 package com.insanusmokrassar.krontab
 
 import com.insanusmokrassar.krontab.internal.*
-import com.soywiz.klock.DateTime
-import kotlinx.coroutines.delay
+import com.insanusmokrassar.krontab.internal.CronDateTime
+import com.insanusmokrassar.krontab.internal.parseDaysOfMonth
+import com.insanusmokrassar.krontab.internal.parseHours
+import com.insanusmokrassar.krontab.internal.parseMinutes
+import com.insanusmokrassar.krontab.internal.parseMonths
+import com.insanusmokrassar.krontab.internal.parseSeconds
 
-data class CronDateTimeScheduler internal constructor(
-    internal val cronDateTimes: List<CronDateTime>
-)
-
-fun CronDateTimeScheduler.next(relatively: DateTime = DateTime.now()): DateTime {
-    return cronDateTimes.map { it.toNearDateTime(relatively) }.min() ?: anyCronDateTime.toNearDateTime(relatively)
-}
-
-suspend fun CronDateTimeScheduler.doInLoop(block: suspend () -> Boolean) {
-    do {
-        delay(next().unixMillisLong - DateTime.now().unixMillisLong)
-    } while (block())
-}
-
-
-fun createCronDateTimeScheduler(incoming: String): CronDateTimeScheduler {
+/**
+ * Parse [incoming] string and adapt according to next format: "* * * * *" where order of things:
+ *
+ * seconds
+ * minutes
+ * hours
+ * dayOfMonth
+ * month
+ *
+ * And each one have next format:
+ *
+ * {number},{number},...
+ *
+ * and {number} here is one of {int}-{int} OR {int}/{int} OR *\/{int} OR {int}.
+ *
+ * Seconds ranges can be found in [com.insanusmokrassar.krontab.internal.secondsRange].
+ * Minutes ranges can be found in [com.insanusmokrassar.krontab.internal.minutesRange].
+ * Hours ranges can be found in [com.insanusmokrassar.krontab.internal.hoursRange].
+ * Days of month ranges can be found in [com.insanusmokrassar.krontab.internal.dayOfMonthRange].
+ * Months ranges can be found in [com.insanusmokrassar.krontab.internal.monthRange].
+ *
+ * @sample "0/5 * * * *" for every five seconds triggering
+ * @sample "0/15 30 * * *" for every 15th seconds in a half of each hour
+ * @sample "1 2 3 4 5" for triggering in near first second of second minute of third hour of fourth day of may
+ */
+fun createSimpleScheduler(incoming: String): KronScheduler {
     val (secondsSource, minutesSource, hoursSource, dayOfMonthSource, monthSource) = incoming.split(" ")
 
     val secondsParsed = parseSeconds(secondsSource)
@@ -51,4 +65,4 @@ fun createCronDateTimeScheduler(incoming: String): CronDateTimeScheduler {
     }
 
     return CronDateTimeScheduler(resultCronDateTimes.toList())
-}
+}
\ No newline at end of file
diff --git a/src/commonMain/kotlin/com/insanusmokrassar/krontab/builder/SchedulerBuilder.kt b/src/commonMain/kotlin/com/insanusmokrassar/krontab/builder/SchedulerBuilder.kt
index c52a9a4..7beb38f 100644
--- a/src/commonMain/kotlin/com/insanusmokrassar/krontab/builder/SchedulerBuilder.kt
+++ b/src/commonMain/kotlin/com/insanusmokrassar/krontab/builder/SchedulerBuilder.kt
@@ -1,10 +1,11 @@
 package com.insanusmokrassar.krontab.builder
 
 import com.insanusmokrassar.krontab.CronDateTimeScheduler
+import com.insanusmokrassar.krontab.KronScheduler
 import com.insanusmokrassar.krontab.internal.CronDateTime
 import com.insanusmokrassar.krontab.internal.fillWith
 
-fun buildSchedule(settingsBlock: SchedulerBuilder.() -> Unit): CronDateTimeScheduler {
+fun buildSchedule(settingsBlock: SchedulerBuilder.() -> Unit): KronScheduler {
     val builder = SchedulerBuilder()
 
     builder.settingsBlock()
@@ -75,7 +76,7 @@ class SchedulerBuilder(
         )
     }
 
-    fun build(): CronDateTimeScheduler {
+    fun build(): KronScheduler {
         val resultCronDateTimes = mutableListOf(CronDateTime())
 
         seconds ?.fillWith(resultCronDateTimes) { previousCronDateTime: CronDateTime, currentTime: Byte ->
diff --git a/src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/CronDateTimeScheduler.kt b/src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/CronDateTimeScheduler.kt
new file mode 100644
index 0000000..68351ea
--- /dev/null
+++ b/src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/CronDateTimeScheduler.kt
@@ -0,0 +1,13 @@
+package com.insanusmokrassar.krontab
+
+import com.insanusmokrassar.krontab.internal.*
+import com.soywiz.klock.DateTime
+
+internal data class CronDateTimeScheduler internal constructor(
+    internal val cronDateTimes: List<CronDateTime>
+) : KronScheduler {
+    override suspend fun next(relatively: DateTime): DateTime {
+        return cronDateTimes.map { it.toNearDateTime(relatively) }.min() ?: anyCronDateTime.toNearDateTime(relatively)
+    }
+}
+
diff --git a/src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/Parser.kt b/src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/Parser.kt
index b10b8fd..dd152eb 100644
--- a/src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/Parser.kt
+++ b/src/commonMain/kotlin/com/insanusmokrassar/krontab/internal/Parser.kt
@@ -2,7 +2,7 @@ package com.insanusmokrassar.krontab.internal
 
 import com.insanusmokrassar.krontab.utils.clamp
 
-private fun createCronDateTimeScheduler(from: String, dataRange: IntRange): Array<Byte>? {
+private fun createSimpleScheduler(from: String, dataRange: IntRange): Array<Byte>? {
     val things = from.split(",")
 
     val results = things.flatMap {
@@ -25,21 +25,11 @@ private fun createCronDateTimeScheduler(from: String, dataRange: IntRange): Arra
     return results.map { it.toByte() }.toTypedArray()
 }
 
-internal fun parseMonths(from: String) = createCronDateTimeScheduler(from,
-    com.insanusmokrassar.krontab.internal.monthRange
-)
-internal fun parseDaysOfMonth(from: String) = createCronDateTimeScheduler(from,
-    com.insanusmokrassar.krontab.internal.dayOfMonthRange
-)
-internal fun parseHours(from: String) = createCronDateTimeScheduler(from,
-    com.insanusmokrassar.krontab.internal.hoursRange
-)
-internal fun parseMinutes(from: String) = createCronDateTimeScheduler(from,
-    com.insanusmokrassar.krontab.internal.minutesRange
-)
-internal fun parseSeconds(from: String) = createCronDateTimeScheduler(from,
-    com.insanusmokrassar.krontab.internal.secondsRange
-)
+internal fun parseMonths(from: String) = createSimpleScheduler(from, monthRange)
+internal fun parseDaysOfMonth(from: String) = createSimpleScheduler(from, dayOfMonthRange)
+internal fun parseHours(from: String) = createSimpleScheduler(from, hoursRange)
+internal fun parseMinutes(from: String) = createSimpleScheduler(from, minutesRange)
+internal fun parseSeconds(from: String) = createSimpleScheduler(from, secondsRange)
 
 internal fun Array<Byte>.fillWith(
     whereToPut: MutableList<CronDateTime>,